Simple Javascript Validation & "Sum" help

Just starting out with javascript. I figured out how to get the fields to sum but wanted to see how someone else would do it. I would also like to see how to validate the form so that the dollar sign and decimal point gets added in to the currency fields but still "add" the result to the total field with the dollar sign. It would be great to have it so only numeric data can be entered in. Thank you...below is what I have...feel free to tweak anything you wish but if you could leave the field names the same I would appreciate it.

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